FreeBSD : xen-kernel -- Certain domctl operations may be abused to lock up the host (103a47d5-27e7-11e5-a4a5-002590263bf5)
High Nessus Plugin ID 84694
SynopsisThe remote FreeBSD host is missing a security-related update.
DescriptionThe Xen Project reports :
XSA-77 put the majority of the domctl operations on a list excepting them from having security advisories issued for them if any effects their use might have could hamper security. Subsequently some of them got declared disaggregation safe, but for a small subset this was not really correct: Their (mis-)use may result in host lockups.
As a result, the potential security benefits of toolstack disaggregation are not always fully realised.
Domains deliberately given partial management control may be able to deny service to the entire host.
As a result, in a system designed to enhance security by radically disaggregating the management, the security may be reduced. But, the security will be no worse than a non-disaggregated design.
SolutionUpdate the affected package.